The need to open smartphone case appears among device owners for a variety of reasons: from a banal battery replacement to a complex repair of the motherboard after moisture has entered. Modern devices are becoming more and more monolithic, and manufacturers deliberately complicate access to internal components in order to protect the device from dust and water, and also force users to contact service centers. However, having the right set of tools and knowledge of technology, disassembling Android becomes a feasible task even for a beginner.
Before taking active steps, it is critically important to assess the risks. Violating the integrity of the factory seals can void your warranty, and careless movement with a scalpel can damage the cables or screen. In this article we will analyze a step-by-step algorithm that will help you understand how to open the phone with minimal risk to electronics, and what pitfalls await you on the way to the insides of the gadget.
Preparation of the workplace and the necessary tools
The success of any technical operation on 80% depends on preparation. You won't be able to neatly disassemble a smartphone, using a kitchen knife or a sewing needle - this is guaranteed to damage the plastic and glass. You will need a specialized kit, which can be purchased in radio parts stores or ordered online.
Pay special attention to organizing the space. The table should be clean, dry and well lit. Small screws tend to get lost at the most inopportune moment, and static electricity can damage sensitive microcircuits. Therefore, having an antistatic mat and bracelet will be a big plus, although for simple operations often just a dry surface is enough.
- 🔧 A set of precision screwdrivers (Torx, Phillips Pentalobe, slotted).
- 🔥 Hair dryer or heat release (to soften the glue under the screen).
- 🎴 Plastic picks and suction cups (for safely prying up the case).
- 🧲 Magnetic mat or container for sorting screws.
- 🧤 Antistatic gloves (optional, but recommended).
If you don’t have a hair dryer, some craftsmen use iron, but this is a risky method as it is difficult to control the heating temperature. It is better to purchase an inexpensive hair dryer with temperature control. Also don’t forget about isopropyl alcohol —it will help dissolve remaining glue and degrease the surfaces before assembly.
☑️ Checking readiness for disassembly
Design features of modern smartphones
Understanding how your device is assembled is the key to success. There are two main types of design: with a removable back cover and a monoblock (unibody). In the first case open case trivially simple: just pry the lid with your fingernail or a pick in a special recess. However, there are fewer and fewer such models.
Most modern flagships and mid-budget models are made using a “sandwich” design, where the screen and back panel are glued to a metal or plastic frame. The glue used is very aggressive, and heating it is a prerequisite for safe disassembly. Trying to pick at a cold case will result in chipped glass or deformation of the frame.
⚠️ Attention: Never try to pry off the screen or back panel with a metal screwdriver without first heating it. Metal easily cuts through glass or leaves deep scratches on the frame that cannot be repaired.
It is also worth considering the location of the components. In some models battery it is located immediately under the back cover, in others - under the motherboard. This affects the sequence of your actions. Study the video disassembly of your particular model before starting work to know which cables come first.
How to determine the type of glue?
Usually manufacturers use double-sided tape or liquid glue B-7000. If the lid begins to come off evenly when heated slightly, this is tape. If the glue threads stretch, it is a liquid composition that requires more thorough cleaning.
The process of heating and opening the perimeter of the case
The most critical stage is breaking the seal of the case. The device must be heated evenly around the entire perimeter. Do not hold the hair dryer at one point for more than 3-5 seconds, so as not to overheat the screen matrix or the battery located nearby. The optimal temperature is about 80-90 degrees Celsius.
After heating (usually 2-4 minutes), apply the suction cup to the back cover or screen (depending on what you are removing) and pull up, creating a small gap. Immediately insert a thin plastic pick into this gap. Do not remove it until you have gone around the entire circle.
Move the pick along the edge, cutting the adhesive layer. If you feel a lot of resistance, stop and warm up the area again. Hurry is unacceptable here.
| Device type | Heating time | Temperature | Risk of damage |
|---|---|---|---|
| Glass back cover | 3-4 minutes | 80-90°C | High (chips) |
| Plastic cover | 2-3 minutes | 70-80°C | Medium (deformation) |
| Screen (with replacement) | 4-5 minutes | 85-95°C | Critical (matrix) |
| Metal case | 3-4 minutes | 80°C | Low (scratches) |
Use thin fishing line or guitar string to run around the corners of the body if the pick gets stuck. The movements should be sawing, but very careful.
Disconnecting power and dismantling internal components
Once the cover is removed, your first task is to de-energize the device. Locate the battery connector on the motherboard and carefully disconnect it with a plastic tool. Only after this can disassembly continue. Working with the board turned on can result in a short circuit.
Next comes the stage of unscrewing the screws. It is important to be pedantic here: the screws can be of different lengths. If you screw a long screw into a short hole, it will puncture the traces on the board or hit the battery, causing damage. Arrange the screws in the order in which you unscrewed them.
When disconnecting the cables, be extremely careful. There are different types of connectors: some flip up, others have a locking latch that you need to bend back. Never pull on the cable itself if it does not give in - check if you forgot to unclip the latch.
- ⚡ Disconnect the battery first, even if you plan to just look inside.
- 🔩 Sort the screws by disassembly stage so as not to confuse them during reassembly.
- 🔌 Disconnect the display and touchscreen cables only after turning off the power.
Often access to the battery is blocked by a metal plate or camera module. They also need to be dismantled. In some cases, the components are glued, and their removal requires additional heat and the use of adhesive solvent.
The golden rule of repair: the first action after opening the case is to disconnect the battery connector. This will save the board from burning if accidentally shorted with a tool.
Specifics of working with adhesive connections and moisture protection
Modern smartphones are often marked IP67 or IP68, which means protection from dust and water. This protection is provided by a tight fit of the parts and special glue. When you open the case, you inevitably break this seal.
If you plan to put the phone back together so that it retains at least minimal splash protection, you will have to remove all the old adhesive. This is a labor-intensive process that requires the use of isopropyl alcohol and a soft cloth. Remaining glue will not allow the new gasket to lie flat.
⚠️ Attention: After self-disassembly, the guarantee for moisture protection will be void. Do not test the “refurbished” phone under a faucet or in a swimming pool, even if you used new glue.
For reassembly, it is best to use a special glue-sealant for electronics (for example, B-7000 or T-7000) or ready-made adhesive frames cut for a specific model. Apply the glue in a thin strip, not reaching 1-2 mm to the edge, so that when squeezed, it does not come out inside the body onto the camera optics.
Device assembly and initial diagnostics
The assembly process is performed in reverse order. Before final gluing the case together, be sure to conduct a test run. Connect the battery, screen and other main cables, but do not close the cover completely. Try turning on the phone.
Check the operation of the touchscreen, display (for dead pixels), cameras, speakers and microphone. Make sure the phone sees the SIM card. If everything works correctly, you can turn off the power to the device, finally lay out the cables and fix the cover.
When gluing, use clamps or thick rubber bands to press the edges of the case while the glue dries (usually 1-2 hours). Do not turn on the phone immediately after gluing, let the sealant set. Carefully remove any excess glue that has been squeezed out with a toothpick until it hardens completely.
The final step will be to clean the case from fingerprints and traces of glue. If you did everything correctly, your Android smartphone will look like new, and you will save a significant amount on the service.
Is it possible to open the phone without a hairdryer?
Technically possible, but highly not recommended. Without heating, the adhesive remains hard and the risk of breaking the case or screen increases to 90%. As a last resort, you can use very hot water in a sealed bag, but this is less effective and dangerous for electronics.
What to do if the cable is torn?
If the display or touchscreen cable is damaged, the entire component will have to be replaced. Camera or button cables can sometimes be repaired using a microscope and a soldering iron, but this requires high qualifications.
Does opening the case affect the operation of NFC?
The opening itself does not affect NFC, unless you damage the antenna, which is often applied to the back cover or glued to it. When replacing the cover, make sure that the new one has a built-in antenna or replace the old one.
How to remove B-7000 glue from the fingers and case?
After hardening, B-7000 glue turns into a rubber-like mass. You can roll it with your fingers. Residues from the case can be easily removed with a cotton swab soaked in isopropyl alcohol or a special glue cleaner.
Is it necessary to calibrate the battery after replacement?
In modern versions of Android, software calibration is usually not required, the system itself calculates the capacity. However, to correctly display the percentage of charge, it is recommended to discharge the phone once before turning it off and charge it to 100% when it is turned off.